NPCs composing that spawngroup :

a_goblin_flame_chanter (50%)

a_goblin_spirit_chanter (50%)

NPCs spawning around that spawngroup :
(Max range : 100)

nurga_172, range=50 (-1446,713,-237)

nurga_175, range=40 (-1453,756,-237)

a_goblin_death_knight (50%)
a_goblin_overseer (50%)

va_nurga_508003, range=48 (-1443,713,-236)

va_nurga_508006, range=3 (-1414,754,-236)

va_nurga_508013, range=40 (-1453,759,-236)